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Genes on sex chromosomes

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Songbirds have a species number close to that of mammals and are classic models for studying speciation and sexual selection. Sex chromosomes are hotspots of both processes, yet their evolutionary history in songbirds remains unclear. We characterized genomes of 11 songbird species, with 5 genomes of bird-of-paradise species. We conclude that songbird sex chromosomes have undergone four periods of recombination suppression before species radiation, producing a gradient of pairwise sequence divergence termed 'evolutionary strata'. The latest stratum was probably due to a songbird-specific burst of retrotransposon CR1-E1 elements at its boundary, instead of the chromosome inversion generally assumed for suppressing sex-linked recombination.
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X Chromosome Fact Sheet

Genes on sex chromosomes
Genes on sex chromosomes
Genes on sex chromosomes
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Sex chromosomes & X-linked inheritance (article) | Khan Academy

Either of a pair of chromosomes in diploid cells, or a single chromosome in haploid cells, carrying genes that determine the sex and sex-linked characteristics of an organism. Most mammals, including humans, have one pair of sex chromosomes in diploid cells, designated XX in females and XY in males. Published by Houghton Mifflin Company. All rights reserved.
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Overview of Genes, DNA, and Chromosomes

Chromosomes are long segments of genes that carry hereditary information. They are composed of DNA and proteins and are located within the nucleus of our cells. Chromosomes determine everything from hair color and eye color to sex. Whether you are a male or female depends on the presence or absence of certain chromosomes. Human cells contain 23 pairs of chromosomes for a total of
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The science community's knowledge of genetics increases every day, making medical discoveries and treatments more likely with each passing day. If you or someone you love has been diagnosed with a genetic condition, you may be finding it difficult to keep up with all of these genetics-based terms. Here are some of the most common terms and what you need to know about them. DNA is made up of four similar chemicals—adenine, thymine, cytosine, and guanine—which are called bases and abbreviated as A, T, C, and G. These bases are repeated over and over in pairs to make up your DNA.
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